ornithine vs aminoalkanoic acid

ornithine and aminoalkanoic acid both are nouns.

Word	Noun	Adjective	Verb	Adverb
ornithine	Yes	No	No	No
aminoalkanoic acid	Yes	No	No	No

As nouns, aminoalkanoic acid is a hypernym of ornithine; that is, aminoalkanoic acid is a word with a broader meaning than ornithine:

ornithine: an amino acid that does not occur in proteins but is important in the formation of urea
aminoalkanoic acid: organic compounds containing an amino group and a carboxylic acid group

Other hypernyms of ornithine include amino acid.

ornithine (noun)	aminoalkanoic acid (noun)
an amino acid that does not occur in proteins but is important in the formation of urea	organic compounds containing an amino group and a carboxylic acid group